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1 - Audio
2 - Receive
3 - Transmit
4 - Ground = Channel Down, 22K Ohm to Pin 3 = Channel UP (was originally listed as 2.2K, a visitor told me it was wrong)
5 - Ground and Switch common
6 - 13.8 Volts. SEE CAUTION BELOW
CAUTION: Shorting-out Pin #6 can cause damage to radio! If you decide to install a new mic, we strongly suggest you remove pin #6 from the mic plug to avoid any possibility of a short!
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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